– Coronavirus infections were already exploding before Beijing’s shift on its strict zero-Covid policy, emergencies director Mike Ryan said
– WHO chief Tedros Adhanom Ghebreyesus said at the same briefing he was hopeful the pandemic will no longer be considered a global emergency some time next year
– Pro-establishment lawmakers at centre of appeals urging authorities to run universal community screening to uncover hidden chains of transmission
– But several experts say such exercises are not feasible because of capacity limitations and challenges tied to citywide lockdown
Depuis le début de l’épidémie de Covid19, les modes précis de la transmission et le rôle des asymptomatiques dans celle-ci font débat. Cette dernière question vient d’être tranchée par l’analyse d’un étude chinoise géante de Wuhan qui démontre que les asymptomatiques ne contaminent personne.
– Paper by Chinese researchers says a strain can be traced to eight countries from four continents before the Wuhan outbreak
– First human transmission may have occurred on the Indian subcontinent, it says – but other scientists question the finding
Les scientifiques n’ont toujours pas découvert comment le virus était passé de la chauve-souris à l’homme. Si la thèse d’un autre animal ayant servi d’hôte intermédiaire reste privilégiée, la piste d’un accident de laboratoire n’est pas complètement abandonnée.
Covid-19, caused by SARS-CoV-2, has been contained in China through stringent non-pharmaceutical interventions. The border control and quarantine have effectively prevented the virus spread by infected travellers, but the risk of resurgence caused by other routes of introduction and transmission remains unclear, and current strategies to prevent resurgence could be flawed. Since July, SARS-CoV-2 RNA contaminations in frozen food imported from countries with ongoing epidemics have been reported in nine provinces in China. However, there is no robust evidence of Covid-19 outbreaks initiated by environment-to-human transmission. Here we add to evidence of such transmission by investigating the recent Covid-19 resurgence in Beijing.
Une virologue de Hong Kong affirme que de nombreuses vies auraient pu être sauvées si la Chine n’avait pas censuré son travail, alors qu’elle a fui le pays par peur de représailles.
BEIJING, 19 juin (Xinhua) — Aucune preuve n’a été découverte concernant la transmission du nouveau coronavirus par l’ingestion d’aliments, dont les fruits de mer, a indiqué vendredi un épidémiologiste chinois, en réponse aux préoccupations du public concernant la sécurité des produits frais.
As of June 8, 2020, the global reported number of COVID-19 cases had reached more than 7 million with over 400 000 deaths. The household transmissibility of the causative pathogen, severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2), remains unclear. We aimed to estimate the secondary attack rate of SARS-CoV-2 among household and non-household close contacts in Guangzhou, China, using a statistical transmission model.
Research by scientist from Wuhan laboratory accused by Donald Trump of being the source of virus that sparked Covid-19 pandemic looks at how Sars-related pathogens have adapted to suit human hosts.
Une étude menée sur les 100 premiers cas confirmés de Covid-19 à Taiwan ainsi que sur leurs contacts proches a été publiée le 1er mai dans le prestigieux Journal of the American Medical Association (JAMA) Internal Medicine. Elle confirme que le risque de transmission du coronavirus à ses proches est le plus élevé pendant les cinq jours suivant l’apparition des symptômes, mais aussi avant même leur apparition.
Rapid spread of severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) in Wuhan, China, prompted heightened surveillance in Shenzhen, China. The resulting data provide a rare opportunity to measure key metrics of disease course, transmission, and the impact of control measures.
La transmission du virus SARS-CoV-2 de l’animal à l’homme reste actuellement une question en suspens sans réponse précise. L’intervention du pangolin comme hôte intermédiaire a été souvent soulignée par les scientifiques sans être confirmée. La recherche du chainon manquant de la transmission permettrait de retracer la généalogie et la génétique du virus. Nous vous présentons une sélection d’articles sur cet animal sauvage méconnu du grand public avant la pandémie et placé aujourd’hui sous les feux de l’actualité. Les recherches en cours nous dirons si cette piste est la bonne…
To investigate the genetic diversity, time origin, and evolutionary history of the 2019‐nCoV outbreak in China and Thailand, a total of 12 genome sequences of the virus with known sampling date (24 December 2019 and 13 January 2020) and geographic location (primarily Wuhan city, Hubei Province, China, but also Bangkok, Thailand) were analyzed. Phylogenetic and likelihood‐mapping analyses of these genome sequences were performed. On the basis of our results, the star‐like signal and topology of 2019‐nCoV may be indicative of potentially large “first generation” human‐to‐human virus transmission. We estimated that 2019‐nCoV likely originated in Wuhan on 9 November 2019 (95% credible interval: 25 September 2019 and 19 December 2019), and that Wuhan is the major hub for the spread of the 2019‐nCoV outbreak in China and elsewhere. Our results could be useful for designing effective prevention strategies for 2019‐nCoV in China and beyond.
Between December 1, 2019 and January 26, 2020, nearly 3000 cases of respiratory illness caused by a novel coronavirus originating in Wuhan, China have been reported. In this short analysis, we combine publicly available cumulative case data from the ongoing outbreak with phenomenological modeling methods to conduct an early transmissibility assessment. Our model suggests that the basic reproduction number associated with the outbreak (at time of writing) may range from 2.0 to 3.1. Though these estimates are preliminary and subject to change, they are consistent with previous findings regarding the transmissibility of the related SARS-Coronavirus and indicate the possibility of epidemic potential.
![Le Dr Cheng Hao-yuan [鄭皓元] (à d.) du CDC de Taiwan a présenté le 2 mai lors de la conférence de presse du Quartier général de lutte épidémique (CECC) l’étude publiée la veille dans JAMA Internal Medicine. © CNA](https://covidasia.hypotheses.org/files/2020/05/DrChengHao-yuan.jpg)
